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If you do run it from a 12V battery I would still use an LM7812 regulator. A car battery can vary from 11.5 to 14.4 Volts depending on the charge in it. I don't know how sensitive your equipment is, but I would be using a regulator to be safe.
I do not like the idea of running a recycled pc power supply from an inverter. The inverter from Aldi(I had one until it blew up) is not a pure sine wave inverter. If the pc power supply does run I would think it would burn out rather quickly.
I like the idea rmcpb had of using a DSE kit to get the correct voltage. Add a couple of these kits to get the correct voltage. These Regulators are 1AMP, but if the transformer has enough current you can piggy back the regulators to double the current. Be sure to adequately heatsink them though.
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